(2006)  
 
Teriha-No-Ibara (Shiny Leaved Field Briar) R. luciae Rochebr. et Franch. ex Crép. (syn. =R. wichuraiana Crép.)
Bull. Soc. Roy. Bot. Belgique 10:324 (1871)
Distribution: Honshu, Shikoku, Kyushu
R. luciae is usually found on the seashore, or on river banks, but sometimes in grassland on high mountains. It blooms later than most other wild roses in section Synstylae. In areas near Tokyo, R. multiflora and R. onoei var. oligantha come in bloom in May, but R. luciae blooms much later, toward mid-June or in early July. It bears white flowers 3 to 3.5 cm across, a little larger than those of R. multiflora. Its inflorescence widely differs in size: some flowers are borne singly, some in large clusters. Shiny round leaflets and canes spreading sideways in a zigzag pattern are its conspicuous features. Its long creeping branches have been inherited by its descendants Wichuraiana Ramblers.

(2006)  
 
Tsukushi-Ibara (Briar from Tsukushi, Kyushu)
R. multiflora Thunb. var. adenochaeta (Koidz.) Ohwi ex H. Ohba
Flora of Japan: 171 (2001)
Distribution: Honshu (western parts of the Chugoku district) and Kyushu
Though this rose is generally considered to be a variety of R. multiflora, the author suspects that it could be a hybrid between R. multiflora and some other roses. Its flowers make a big panicle like R. multiflora, but their colour is varying shades of pink, and the whole bush, spreading its canes very vigorously, is larger than R. multiflora. It also differs from R. multiflora in that it has glandular hairs on its peduncles, calyx tubes, and the outer surface of its sepals. Sometimes this rose is confused with a wild variety in SW China, R. multiflora var. cathayensis Rehder et Wilson, but flowers of var. cathayensis make small corymbs, and have no glandular hairs like var. adenochaeta. The large colony of R. multiflora var. adenochaeta on the banks of the Kuma River in Kumamoto Prefecture, Kyushu, is widely known for its breathtaking appearance when the roses are fully in bloom. This variety is also used as an understock rose in Japan.

(2006)  
 
Yabu-Ibara (Thicket Briar) syn. = Nioi-Ibara (Scented Briar)
R. onoei Makino var. onoei
Bot. Mag. Tokyo 23:147 (1909) (syn. =R. jasminoides Koidz.)
Distribution: SW-Honshu (south of the Median Tectonic Line), Shikoku, and Kyushu

This is the wild rose with the smallest leaves and flowers in Japan: the size of flowers is ca. 1.5 cm, and its peduncle and calyx are normally villous. Usually 2 to 5 flowers make small panicles. The hips are small and almost globular, 5 to 6 mm across. A local variation of this rose in Shikoku bears particularly small flowers. Its long terminal leaflet is another feature of this rose.

(2006)  
 
Yabu-No-Ibara (Thicket Field Briar)
R. x pulcherrima Koidz. nothovar. multionoei H. Ohba
Flora of Japan: 177 (2001)
Estimated parentage: R. multiflora x R. onoei var. onoei

(2006)  
 
Yabu-Teriha-No-Ibara (Thicket Shiny Leaved Field Briar) R. makinoana H. Ohba (syn. =R. luciae Rochebr. et Franch. ex Crép. var. paniculata Makino)
Flora of Japan: 177 (2001)
Estimated parentage: R. luciae x R. onoei var. onoei

(2006)  
 
Yama-Ibara (Mountain Briar) R. sambucina Koidz.
Bot. Mag. Tokyo 31:130 (1917)
Distribution: West Honshu (Aichi Prefecture and further west, the Kinki district, the Chugoku district), Shikoku and Kyushu
The flowers of this rose resemble those of R. multiflora in shape: however, this rose grows more vigorously and puts forth longer stems which sometimes climb on other trees. Its flowers are larger than those of R. multiflora, ca. 3.5 cm across, and also leaves with 3 to 5 leaflets are much larger than those of R. multiflora. The shape of its inflorescence also differs: unlike other roses in this section, whose flowers are arranged in panicles, this rose bears its flowers in big corymbs.